Regensburg 2010 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 38: Layer Properties: Electrical, Optical and Mechanical Properties
DS 38.5: Vortrag
Donnerstag, 25. März 2010, 15:00–15:15, H8
Photo-switchable azomolecule containing nanocomposites — •Christina Pakula1, Christian Hanisch1, Thomas Strunskus1, Dordaneh Zargarani2, Vladimir Zaporojtchenko1, Rainer Herges2, and Franz Faupel1 — 1Materialverbunde, Institut für Materialwissenschaft, CAU Kiel, Kaiserstr. 2, 24143 Kiel — 2Otto Diels-Institut, CAU Kiel, Otto-Hahn-Platz 3/4, 24118 Kiel
We report on the electro-optical properties of nanocomposites based on polymer thin films with dissolved azobenzene chromophores containing embedded gold nanoparticles. The physical properties of these composites can be changed reversibly by illumination with UV and visible light, due to the conformational change of the switchable azomolecules. We examined the isomerization and the time dependence in optical switching with UV and visible light of an azobenzene ether dissolved in a PMMA (and a PDMS) matrix in combination with 2D and 3D gold nanoparticle arrays. The chromophore/polymer film was prepared by spin-coating and the metal clusters were deposited either by thermal evaporation or via sputtering and subsequently embedded into the polymer matrix. We discuss the photo-switchable changes in resistance of the 2D/3D-Au nanocomposite films. To improve the reversible switching effect, composites with MWCNTs instead of gold nanoparticles have also been tested and the results will be discussed.